In message <39956750.A6961B6A@augustsson.net>Lennart Augustsson writes

>Right now only those based on the FTDI chip work.  The reason is that
>the people making these adapters seem to hate to give out any information
>about them (FDTI was an exception).  See uftdi(4).

Are they clearly labelled as such? Any currently-for-sale brands
you can recommend?  (its not always easy to find   chipset info).

Also, how many ports do the devices have? With two serial cables per
machine, its pretty easy to get to a point where a Cyclades (or
Rocketport, drivers, sigh) starts to win on cabling count.